Welding materials for connection of low thermal expansion coefficient alloys

A technology of low thermal expansion coefficient and welding materials, applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problem of large tendency of hot cracking, and achieve the effect of controlling the tendency of hot cracking

Inactive Publication Date: 2013-09-04
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, alloys with a low thermal expansion coefficient are usually nickel-based alloys, which have a large tendency to hot cracking under welding conditions, especially in marine multi-layer multi-pass welded structures

Method used

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  • Welding materials for connection of low thermal expansion coefficient alloys
  • Welding materials for connection of low thermal expansion coefficient alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Select Ni, C, Mn, Si, Ti, Co, Sc 2 o 3 Powder mixing, the weight ratio is as follows: Ni: 35.8%; C: 0.1%; Mn: 1.2%; Si: 0.08%; Ti: 1.1%; Co: 0.5%; Sc 2 o 3 : 3.0%; Fe: balance; impurity control: S≤0.01%; P≤0.01%.

[0022] Prepare according to the following production process:

[0023] (1) Dosing, mixing evenly, and compacting according to the above-mentioned component distribution ratio;

[0024] (2) Vacuum melting is carried out by vacuum induction melting. The temperature of vacuum induction melting is 1420°C; the heating time is: the thickness of the cross-section of the sample is 11-20 minutes per centimeter; that is, the thickness of the cross-section is 2cm, and the vacuum induction melting The time is 22 to 40 minutes;

[0025] (3) After the mold shell is poured, it is cooled naturally;

[0026] (4) The ingot is formed into a bar;

[0027] (5) Carry out heat treatment on the bar. The process is as follows: heat the sample to 790°C, keep it warm for 30 minu...

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Abstract

The invention discloses welding materials. The thermal expansion coefficient is from 1.53 *10-6 to 2.84 * 10 - 6k -1. The welding materials are mainly formed by, by weight percent, nickel of 35% to 36.5%, carbon of 1.15 % to 0.12 %, manganese of 1.0% to 3.0 %, silicon of 0.01 % to 0.1 %, titanium of 0.8 % to 1.5 %, cobalt of 0.4 % to 0.7 %, scandium oxide of 0.5 % to 8.0 %; the balance to be ferrum; and the impurity S is no more than 0.01 % and the P is no more than 0.01 %. The production technology comprises compounding materials; performing vacuum induction melting; naturally cooling after a mold casing is achieved pouring; performing ingot pressing and forming; and performing an annealing process. The welding materials can be used for welding of low thermal expansion coefficient alloys and also can be served as buffering materials to achieve heterojunction of materials such as the low thermal expansion coefficient alloys and higher thermal expansion coefficient carbon steel.

Description

technical field [0001] The invention relates to welding of an alloy with a low thermal expansion coefficient, in particular to a welding material required for welding an alloy with a low thermal expansion coefficient under the condition of adding flux or not adding flux, and belongs to the technical field of welding metallurgy. Background technique [0002] Welding consumables are a general term for materials consumed during welding, and are one of the materials required for the manufacture of large-scale welded components, especially in the manufacture of large-scale welded components in shipbuilding (such as LNG ships, etc.), aviation and other industries. The quality of materials has higher requirements. With the development of economy and technology, more and more alloys with low coefficient of thermal expansion have become the preferred alloys for many high-end equipment manufacturing, such as cemented carbide, Invar alloy, Kovar alloy, etc. Low thermal expansion coeff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
Inventor 徐培全曹晓莲马丁
Owner SHANGHAI UNIV OF ENG SCI
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